Eliko Eliko - 2 months ago 24
iOS Question

Getting Data from Firebase in Swift 3.0

I am using an app with Firebase.

After moving to swift 3.0 today, Xcode asked me to change this code:

ref.observeEventType(.ChildAdded, withBlock: { snapshot in
let currentData = snapshot.value!.objectForKey("Dogs")
if currentData != nil {
let mylat = (currentData!["latitude"])! as! [String]
let mylat2 = Double((mylat[0]))
let mylon = (currentData!["longitude"])! as! [String]
let mylon2 = Double((mylon[0]))
let userid = (currentData!["User"])! as! [String]
let userid2 = userid[0]
let otherloc = CLLocation(latitude: mylat2!, longitude: mylon2!)
self.distanceBetweenTwoLocations(self.currentLocation, destination: otherloc, userid: userid2)
}
})


to this code:

ref.observe(.childAdded, with: { snapshot in
let currentData = (snapshot.value! as AnyObject).object("Dogs")
if currentData != nil {
let mylat = (currentData!["latitude"])! as! [String]
let mylat2 = Double((mylat[0]))
let mylon = (currentData!["longitude"])! as! [String]
let mylon2 = Double((mylon[0]))
let userid = (currentData!["User"])! as! [String]
let userid2 = userid[0]
let otherloc = CLLocation(latitude: mylat2!, longitude: mylon2!)
self.distanceBetweenTwoLocations(self.currentLocation, destination: otherloc, userid: userid2)
}
})


But in the second line it gives me an error:


Cannot call value of non-function type 'Any?!'


This is the json data in the FireBase:

{
“user1” : {
"Dogs" : {
"User" : [ "siACmQZ7MDclDSO3hrCOp953kfl2" ],
"latitude" : [ "32.172344" ],
"longitude" : [ "34.858068" ]
}
“user2” : {
"Dogs" : {
"User" : [ "siACmQZ7MDclDSO3hrCOp953kfl2" ],
"latitude" : [ "32.172344" ],
"longitude" : [ "34.858068" ]
}
“user3” : {
"Dogs" : {
"User" : [ "siACmQZ7MDclDSO3hrCOp953kfl2" ],
"latitude" : [ "32.172344" ],
"longitude" : [ "34.858068" ]
}
}

Answer

This is the right solution, after fixing my code:

ref.observe(.childAdded, with: { snapshot in
            if let snapshotValue = snapshot.value as? [String:Any],
                let currentData = snapshotValue["Dogs"] as? [String:Any] {
                let userid = (currentData["User"])! as! [String]
                let userid2 = userid[0]
                let mylat = currentData["latitude"] as! [String]
                let mylat2 = Double((mylat[0]))
                let mylon = (currentData["longitude"])! as! [String]
                let mylon2 = Double((mylon[0]))
                let otherloc = CLLocation(latitude: mylat2!, longitude: mylon2!)
                self.distanceBetweenTwoLocations(self.currentLocation, destination: otherloc, userid: userid2)
            }